Item Type: Round Die Tapping Chuck Material: Carbon Steel Interface Outer Diameter: Approx. 31mm/1.2in Maximum Thread Depth: Approx. 72mm/2.8in Package List 1 x Round Die Tapping Chuck 1 x Hex Wrench 1Stable Clamping: This is a round die tapping chuck, precisely manufactured, with high mechanical performance, will provides firm and stable clamping. 2Standard Size: This round die tapping chuck is standard in size, the outer diameter of the interface is 31mm, and the maximum thread depth is 72mm. 3Carbon Steel Material: This chuck is made of carbon steel, the surface is quenched and blackened, with strong oxidation resistance, high hardness and long service life. 4Quick Installation: This round die tapping collet allows quick and easy installation and removal, saves you a lot of time when switching between applications. 5Multi Purpose: This high precise round die chuck is widely used in tapping machine, drilling machine, milling machine, boring machine, pneumatic tool, etc.